Office chair



FIG. 1 is a front, right, top perspective view of an office chair showing my design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a left-side elevation view thereof.

FIG. 5 is a right-side elevation view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

CLAIM The ornamental design for an office chair, as shown and described. 